Which expression represents the total net force on the block? a) 20n + 10n b) 20n x 10n c) 10n + -20n d) 12n 10n

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents